IC Pin orientation

Discussion in 'General Electronics Chat' started by Razor Concepts, Mar 22, 2010.

  1. Razor Concepts

    Thread Starter Active Member

    Oct 7, 2008
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    1
    Can anyone help me identify which pin on this TDA2822 is pin number one?
     
  2. SgtWookie

    Expert

    Jul 17, 2007
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    The manufacturer's datasheet is always the best place to start:
    http://www.st.com/stonline/products/literature/ds/1463/tda2822d.pdf

    What's a bit unusual in your case is that there is no dimple next to the #1 pin as shown in the datasheet.

    However, you can assume that with the writing oriented so that you can read it (as in the photo you posted), that pin #1 is on the lower left.

    From there to the right, it's 2, 3, 4 - then straight up to #5, then left to pins 6, 7, 8 in that order.

    It's not really intuitive, but after you've looked at a few dozen IC's, you start to realize that when the writing is how you can read it, pin #1 is on the lower left.

    [​IMG]
     
    Last edited: Mar 22, 2010
    Razor Concepts likes this.
  3. retched

    AAC Fanatic!

    Dec 5, 2009
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    Is there a dimple on the bottom?
     
  4. SgtWookie

    Expert

    Jul 17, 2007
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    Retched,
    Please don't confuse our OP.

    ST Microelectronics frequently uses just their logo to represent the dimple. It saves a manufacturing step.
     
  5. retched

    AAC Fanatic!

    Dec 5, 2009
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    I wasn't trying to confuse our OP.

     
  6. Razor Concepts

    Thread Starter Active Member

    Oct 7, 2008
    212
    1
    Thanks, I didn't realize ST used their logo as a kind of dimple. Anyways it works perfectly now :)
     
  7. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The datasheet also shows a line or a bevel on the edge beside pins 1 to pin 4. The photo seems to show a bevel only on that side.
     
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